Title:
METHOD FOR EVALUATING WEATHERING DEGREE OF COAL, METHOD FOR EVALUATING COKING PROPERTIES OF WEATHERED COAL, METHOD FOR CONTROLLING WEATHERING DEGREE OF COAL, AND METHOD FOR PRODUCING COKES
Document Type and Number:
WIPO Patent Application WO/2014/167843
Kind Code:
A1
Abstract:
Provided are: a method for evaluating the weathering degree of a coal and the coking properties of a weathered coal, said weathering degree and coking properties each falling within a range in which conventional methods are not usable in measuring the same, by using an index that enables the evaluation of an effect on coke strength; and a method for controlling the weathering degree of a coal using the above-said index, whereby a weathered coal can be added to a coal blend for producing cokes without lowering the coke strength. The weathering degree of a coal is evaluated by using as an index the surface tension of a semi-coke that is obtained by thermally treating a weathered coal. Further, the surface tensions of semi-cokes of multiple brands, which are obtained by thermally treating coals of the multiple brands contained in a coal stock, are preliminarily determined. Also, the ratios of the coals of the individual brands in the coal stock are assessed. Then, the weathering degrees of the coals of the individual brands are controlled so that the interfacial tension γinter of a semi-coke compound, which is obtained by mixing the semi-cokes of the individual brands in accordance with the ratios thereof, does not exceed 0.03 mN/m.
Inventors:
SUMI HIROYUKI (JP)
ANYASHIKI TAKASHI (JP)
FUKADA KIYOSHI (JP)
DOHI YUSUKE (JP)
FUJIMOTO HIDEKAZU (JP)
SHIMOYAMA IZUMI (JP)
ANYASHIKI TAKASHI (JP)
FUKADA KIYOSHI (JP)
DOHI YUSUKE (JP)
FUJIMOTO HIDEKAZU (JP)
SHIMOYAMA IZUMI (JP)
Application Number:
PCT/JP2014/002013
Publication Date:
October 16, 2014
Filing Date:
April 08, 2014
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
G01N33/22; C10B57/00; G01N13/00; G01N17/00
Foreign References:
| JP3302446B2 | 2002-07-15 | |||
| JP2012211332A | 2012-11-01 | |||
| JP2005281355A | 2005-10-13 | |||
| JP3302446B2 | 2002-07-15 |
Other References:
D. W. FUERSTENAU ET AL.: "CHARACTERIZATION OF COAL OXIDATION AND COAL WETTING BEHAVIOR BY FILM FLOTATION", COAL PREPARATION, vol. 10, 1992, pages 1 - 17, XP008178321
JOURNAL OF THE FUEL SOCIETY OF JAPAN, vol. 58, 1979, pages 112
COKE CIRCULAR, vol. 37, 1988, pages 209
COKE CIRCULAR, vol. 23, 1974, pages 88
D-W. FUERSTENAU; JIANLI DIAO, COAL PREPARATION, vol. 10, 1992, pages 1 - 17
D.W. FUERSTENAU, INTERNATIONAL JOURNAL OF MINERAL PROCESSING, vol. 20, 1987, pages 153
See also references of EP 2985602A4
JOURNAL OF THE FUEL SOCIETY OF JAPAN, vol. 58, 1979, pages 112
COKE CIRCULAR, vol. 37, 1988, pages 209
COKE CIRCULAR, vol. 23, 1974, pages 88
D-W. FUERSTENAU; JIANLI DIAO, COAL PREPARATION, vol. 10, 1992, pages 1 - 17
D.W. FUERSTENAU, INTERNATIONAL JOURNAL OF MINERAL PROCESSING, vol. 20, 1987, pages 153
See also references of EP 2985602A4
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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